Insulator-supporting pin.



C. L. PEIRCE, JR.

INSULATOR SUPPORTING PIN.

APPLICATION FILED MAY 7, I916.

Patented Oct. 24, 1916.

porn si -r nse CHARLES L. PEIBCE, JR., 013 PITTSBURGH, BENNSYLVANTA, ASSIGNOR OF ONE-HALF TO HUBBARD & 00., F PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENIN- s'rnvnnra.

INSULATOR-SUIPPORTING PIN.

Specification of Letters Patent.

Patented Get. 24:, 1916.

Application filed May 17, 1916. Serial No. 98,030.

To all whom it may concern:

Be it known that I, CHARLnsL. Pnrncn, Jr, a citizen of the United Fat-ates, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and'useful Improvements in lnsulator Supporting Pins, of

' which the following is a specification.

My invention relatesto insulator supporting pins particularly to metal pins adapted to be secured against the sides of wooden cross-arms.

By clamping pins against the sides of wooden cross-arms there is considerable saving inmaterial and expense, for the crossarms do not have to be bored and consequently the dimensions of the arm can be materially reduced as unbored arms are considerably stronger than bored arms. Metal pins have been made for application to the sides of wooden cross-arms and some of these pins have been bent up from stock material such as channel bar. However, where the pins are bent up from stool; material, the proper distribution of strength cannot be obtained without excess of metal. The weakest section of the pin is between the cross-arm and the insulator receiving end and this section must therefore be made the strongest. Where the pin is made up of stock material extra size must be taken in order to get desired strength above the crossarm and the lower end of the pin will there fore have excess metal with corresponding excess weight and waste. Another disadvantage of using pins formed up of stock material is that there is not always sutiicient seating on the pin for engagement with the wooden cross-arm.

The object of my invention is therefore to provide construction for overcoming the above disadvantages and to produce a pin in which the metal is accurately distributed in accordance with the strength necessary at the various sections, and which has ample seating surface for wooden cross-arms. l n

accordance with. my invention 1 press up pins from a single piece of sheet metal of proper sage and to form to give the necessary seating surfaces and strength distribution, the upper part of the pin above the cross-arm being of -circular cross-section throughout and overhanging the cross-arm to give additional strength to such upper part against bending.

On the accompanying drawing 1 have shown a pin embodying the various features of my invention.

()n this drawing Figure 1 is a side elevational view of .a pin secured by a strap to a cross-arm, the cross-arm being shown in section, Fig. 2 is a front elevational view, Fig. 3 is a rear view of the pin and Fig. 4: 1s a sectional view on plane l-l, Fig. 3.

The pin shown is pressed up from a fiat blank of sheet metal and comprises a lower cr0ss-arm engaging part 10 and an upper insulator receiving part 11. The lower part 10 18 of arched or U-shaped cross-section and has preferably the peripheral laterally eX- lending flanges 12 for providing-ample seatshown it is conical, the upper end being threaded to directly receive an insulator or being provided with an insulator receiving thiinble 13 shown as being in the form of a wire helix. The arched lower part 10 has the holes 14 and 15 which may be spaced to receive bolts or screws for passing into or through a wooden cross-arm X, or, as shown, these holes receive the threaded ends 16 and 17 of a strap 18 passing around the cross-arms. Preferably, the edges of the flanges 12 are deflected forwardly at intervals to provide points 19 for sinking into the wood to assist in locking the pin thereto.

The upper part 11 of the pin being closed and of circular cross-section throughout possesses maximum strength with minimum amount of metal and this part of the pin is then particularly strong against bending between the cross-arm and the insulator receiving threads. In order to further strengthen the pin against bending the front lower edge 20' of the upper part 11 is positioned to overhang and seat against the top of the crossarm or to seat against the upper end 16 of the strap. Such engagement also assists in securing the pin against vertical displacement-on the armand to remove considerable shearing load from the strap ends. lVith the arrangement shown and described the central plane of the pin is substantially c0- incident with the plane of the inner face of the cross-arm and therefore the service weight on the cross-arm is in the plane of engagement of the cross-arm with the supporting pole. When a strap is used to secure the pin to the arm the arm will be securely clamped and strengthened against splitting and with the top of the pin overhanging and seating on top of the arm a very strong and rigid structure results which will sustain very heavy loads as compared with loads sustained with wooden cross-arms with pins seated. in bores through the arm.

Copies of this patent may be obtained for five cents each, by addressing the of circular cross-section throughout with its base extended a distance in front of the lower part in order to overhang the top of a cross-arm.

2. The combination with a cross-arm, of an insulator supporting pin pressed up from a single piece of sheet metal, the lower part of said pin being flat and of arched crossse ction and having laterally extending flanges for seating against the cross-arm side, said lower part having bolt holes, a

strap encircling the cross-arm and extending at its ends through said bolt holes, the upper part. of said pin above the cross-arm being of circular cross section throughout and overhanging said cross-arm a distance to seat at its lower end against the top of the strap.

In witness whereof I hereunto subscribe my name this 11th day of May, A- D. 1916.

CHARLES L. PEIRCE, JR.

Commissioner of Patents.

Washington, D. C." 

